Riveting or staking machine



. 5, 1944. H. BLoss RIVETING OR STAKING MACHINE Filed March 23, 1944 3 Sheets-Sheet 2 Dec. 5, 1944.

H. BLoss 2,364,420 RIVETING OR STAKING MACHNE Filed March 25, 1944 3 Sheets-Sheet 3 gig. 3- 504 55 l O6 115 114 l kwa@ 85 50 im; :A 5,.

Patented Dec. 5, 1944 UNITED STATES PATNT ori-ICE BIVETING R STAKING MACHINE Herman Bloss, Shelton, Conn.

Application March 23, 1944, Serial No. 527,768

15 Claims.

This invention relates to riveting or staking machines and, more especially, to a tool of this type designed for relatively light work. In the past, machines for performing the work of riveting have been relatively expensive and complicated and there has been a scarcity of such devices suitable for light work upon which satisfactory and efficient riveting or staking can be accomplished.

One object of the present invention is to provide a relatively simple and inexpensive riveting machine which will be eilicient in operation.

A further object of the invention is to provide a riveting machine having means -ior holding the hammer arm in raised position ready for an operative stroke, which means is'of novel construction and operation.

A further object of the invention is to provide a riveting machine of the character described, which shall have improved means for bringing about the power stroke of Athe hammer.

Still another object of the invention is to provide a riveting machine which will have improved means for bringing about the power stroke of the hammer and which will also have improved means for returning the hammer to its original position in readiness for a further operation.

Still another object of the invention is to provide a riveting machine having power means for eiecting an operative stroke of the hammer and having power means for effecting a return stroke of the hammer, the latter means so arranged that it will be automatically eiective so that once the tool is set in operation the hammer will be brought down upon 'the tool and will also be returned to its original position where it will be held until a further operation is required.

To these land other ends, the invention relates to the novel features and combinations of parts to be hereinafter described and claimed.

In the accompanying drawings:

Fig. 1 is a side elevational view of a riveting or staking tool embodying my invention, with some parts being shown in section;

Fig. 2 is a sectional view of a riveting or staking tool of modiiied form; and

Fig. 3 is a View similar to Fig. 2, showing a further modiiication.

To illustrate a. preferred embodiment of my invention, I have shown in Fig. 1 of the drawings a tool comprising a base or bed I0, from which rises an arm II carrying a vertically disposed sleeve I2. Within this sleeve is slidably mounted a tool holder I3 to which may be removably secured a proper tool I4. This tool may be secured to the tool holder by means of the threaded connection shown at I5, so that the tool may be removed to be replaced by a new one or one of a different type. Secured to the tool holder I3 is a pin I3 which is adapted to slide in a slot I1 in sleeve I2, and a spring I3 is connected to the pin I6 and to a pin I3 secured in sleeve I2 to maintain the tool in an elevated position as shown ready for an operative stroke upon the work.

Adjacent the sleeve I2, a buier or shock absorbing device may be carried by the arm II. This device may comprise a bolt or pin 20 having a head 2|, the body of the bolt passing through the arm or standard II, and having a nut 22 secured upon its lower end. The standard II is provided with a socket 23 within which is seated a spring 24, which spring acts against the bottom of the socket and the head 2l of the bolt to maintain the latter in raised position and to cushion the blow of the hammer when the latter is near the end of its operative stroke.

Secured at the rear end of the standard II is a post 25 having an upper bifurcated end 23 be- 25 tween the parts of which is pivoted a hammer arm 21 upon the pivot pin 23, passing through the bifurcated portions of the post. The' arm 21 carries at its forward end the hammer 29 which may be of considerable weight compared to the associated parts so that it will drop with considerable gravitational force upon the tool carrier I3. If desired, means such as rubber bands 30 may be employed to assist the operative or downward stroke of the hammer.

At its rear end, the hammer arm 21 is provided with a handle 3l, by which it may be manually returned to its raised position after having descended upon the tool holder. Also, rearwardly of the pivot 28, the arm 21 is provided with a laterally projecting pin 32 adapted to be received in a notch or recess 33 formed in a latch member 34 when the hammer arm is in raised position as shown in Fig. 1.

The latch member 34 is pivoted to the post 25 at 35 and an actuating link 36 is pivoted to the lower end of this member, as at 31. A spring 33 is connected at one end to a pin 39 on the post 25, and at the other end to a pin 4I) on the latch member 34, to normally .urge the upper end of the latch member toward the left as shown lin Fig. 1, or toward its operative position. A stop pin 4I may be provided inthe post or standard 25 to limit the movement of the member 34 under the impulse of the spring.

Pivoted to the bed I0 at 42 is a trigger or actuating member 43 which is also pivoted to the link 33 at 44. Supported on the bed |3 is an anvil 43, upon which the work is adapted to rest. The latch member 34 is provided with a. camshaped upper end 41 designed to be engaged by the pin 32 upon the return or upstroke of the hammer to cam the latch member 34 rearwardly, so that the pin 32 may enter the notch 33.

The operation of my device is as follows.. As shown in Fig. 1, the parts are in a position oi' rest, ready for an operative stroke. 'I'he hammer, at this time, is held in its elevated position by the engagement of the pin 32 in the recess 33 of the latch element 34. The operator of the machine may press downwardly on the trigger 43 which rocks the latch element 34 about the pivot 33 and moves the upper end of this member rearwardly so as to disengage the pin 32 from the notch 33. As soon as this disengagement takes place, the hammer descends upon the tool holder |3 either by reason of its own weight or by reason of its weight and the impulse of the rubber bands 33. The tool |4 is thus driven down upon the work which rests on the anvil 43. As the hammer 23 moves toward the bottom of its stroke, it strikes the buffer or shock absorber 2|, and its descent is checked by the spring 24.

At this time, the upper end of the latch member 34 will be drawn forwardly against the pin 4| by its spring 33. To return the tool to its original position which is the position shown in Fig. 1, the operator grasps the handle 3| and draws itV downwardly, thus raising the hammer and bringing the pin 32 into engagement with the cam surface 41 of the latch element 34 to cam this element rearwardly against the tension of the spring 33 until the pin 32 is opposite the mouth of the notch 33, at which time the latch member 34 springs forwardly to engage the pin 32 and hold the hammer in the position shown.

In Fig. 2 of the drawings, I have shown a modined form of a device in which the operative stroke of the hammer is eiIected by a power-operated device such as a solenoid, for example. In this instance, the frame of the tool is shown at 33, upon which are a pair of spaced flanges 33, only one of which is shown in the drawings and between which much of the operating mechanism is mounted, as will be presently described. A bed 3| is secured to the forward part of the frame which carries the work support or anvil 32. A tool holder 33 and buii'er structure 34 are mounted in a forward portion of the frame, and are substantially like the corresponding parts shown in Fig. 1 of the drawings, so that further description of these elements will be unnecessary.

The hammer is shown at 33, the hammer being carried at the forward ends of a pair of spaced arms 33 (only one being shown in the drawings), which arms are pivoted between the flanges 33* by the pivot pin 31. 'I'hese arms are also connected by pins 33 and 33, and by plate 33 to which is secured by the adjusting screw 3l a return spring 32, the lower end of which is secured to a pin 33 extending between the flanges 33.

The latch member 33, having a disk-like lower end portion 33, is pivoted upon a pin 31 supported by the iianges 33", which latch member is provided with a recess or notch 33 adapted to engage the pin 53 when the hammer is in an elevated position, and also provided with anyupper camshaped end 33 with which the pin 33 engages upon the upstroke of the hammer to, cam theA latch member rearwardly or toward the right, as shown in Fig. 2.

The latch member 33 is urged against a stop pin 13 by a spring 1| secured at one end to a pin 12 on the latch member, and secured at the other end to the frame 33 as shown at 13.

A solenoid 13 may be employed to effect the down stroke of the hammer, the case of which is pivoted to the frame at 13, which solenoid is provided with a plunger 11 pivoted at 33 to the arms 33. As the point 33 moves about the pivot pin 31 during the movements of the hammer, it is desirable to pivot the case of the solenoid at 13 so that it may swing to accommodate itself to the arcuate movement of the pin 33. The solenoid is adapted to be energized through wires 13 and 13, one of which leads to a terminal of the coil of the solenoid and the other of which leads to switch contacts 33 and 3| insulated from each other as at 32. The lower ends of these members constitute a switch 33 to complete the circuit when they are brought into contact.

Controlling means are provided for controlling the operation of the device, which means comprise av disk-like member 34 pivoted upon the pin 31 adjacent the part 33 of the latch member 33. This disk-like member has projecting arms 33 and 33. To the latter arm is secured a link 31 leading to a pedal or foot control for the device. I also provide a hand control for the operation of the tool, which is constituted by a trigger 33 pivoted to the bed at 33 and also pivoted at 33 to a link 3| upon which is a pin 32 engaged in an elongated slot 33 in the arm 33. It will be noted that the link 3| is outside and not between the flanges 33", so that the pin 32 must extend through one of these flanges which is provided with a slot 34 for this purpose. Also, the arm 33 is provided with a forwardly projecting member 31 designed to engage the lower ends of the contact members 33 and 3| and force them together to close the switch 33, and complete the current through the solenoid.

It may be noted that the disk 34 is provided with elongated arcuate slots 33, within which lie pins 33 secured to the disk-like member 33, so that the members 33 and 34 are connected by a lost motion connection, allowing independent movement between these parts in one direction. It will also be apparent that, when either the link 31 leading to the foot control or when the hand control member 33 is operated downwardly, the arm 33 will be moved toward the left as `shown in Fig. 2, thus closing the switch 33 and also swinging the latch member 33 in a clockwise direction. 'When the controls are released, the arm 33 will be restored to its original position by'the spring |33 secured at one end to the arm 33 and atkthe other end to the ilange 33.

As shown in Fig. 2, the hammer is at the bottom of its stroke and it will be assumed that the controls have been released s0 that the springs 1| and |33 have returned the latch member 33 and the disk 33 to the positions shown. The switch 33 is therefore open and the solenoid deenergized. The spring 32 will therefore return the hammer to its elevated position. During this movement, the pin 33 acting on thecam surface 33 will cam the latch member 33 in a clockwise direction to permit the pin 33 to enter the slot 33. During this movement of the latch member 33, the arm 33 will remain stationary as independent movement of the arm 33 will be permitted by movement of the pins 33 in the slots 33 so that the latch member 33 may move to a sufiicient extent in a clockwise direction to permit the pin 33 to enter notch 33 without any movement oi' the disk 84. Thereafter, the spring 1| will return the latch member 65 to its position against the stop pin 10, at which time the hammer will be held in its elevated position ready for a further operation.

With the hammer s held, the operator may actuate the manual hand control 88 or the foot lever 81, thus rotating the disk-like member 84 and swinging the latch member 65 in a clockwise direction to release pin 59. At the same time, the arm 85 is moved to the left to close the circuit through the switch 83 and energize the solenoid which effects an operative downward stroke of the hammer against the tool holder 53 in opposition to the tension of the spring 62. Upon release of the control members, the arm 85 is moved rearwardly by the spring |00 which opens the switch 83 and permits the return spring 62 to elevate the hammer.

In Fig. 3 of the drawings, I have shown a further modiilcation of my device which is quite similar to that shown in Fig. 2 except that the return stroke of the hammer is also e'ected by a solenoid instead of by means of a spring. In this case, the frame of the machine is shown at 50, having flanges '50* between which the principal operating parts of the device are mounted. The hammer 55, hammer arms 56, pivots 51 and 58, and the solenoid 15, pivoted at 16, are similar to the corresponding parts previously described in connection with the structure shown in Fig. 2.

The arms 56 may be provided with additional openings |02 for reception of the pin 58 to permit adjustment of the hammer stroke by adjusting the point of connection of the plunger 11 of the solenoid to the arms.

At their rear ends, the arms are provided with a pin 59 designed to cooperate with a latch member 65 similar to that previously described, this member being pivoted' at 61 to the frame of the machine and also having a slot and pin connection 98 and 99 with the control member 84, which carries an arm 85 designed to -be operated by the hand control member 88.

Also connected to the pin 59 is a link |04 secured by a turnbuckle |05 to the plunger I 06 of a second solenoid |01, the case of which is pivoted to the frame at |08, which solenoid, it will be understood, operates to eiect a return stroke of the hammer.

Current may be delivered to the solenoids 15 and |01 by the lead wires |09 and I I0, which wires are connected to the solenoid 15 through the switch II I and to the solenoid I 01 through the switch II2. The arm 85, connected to the disk 84, is provided with switch-operating projections II3 and II4, so that, when this arm is moved in one direction, it will close the circuit through the switch III, and when moved in the other direction it will close the circuit through the switch H2, the arm being held in the position shown in Fig. 3 by the spring II5. It will be understood that in this instance the pins 99 are secured to the disk 84 and the slots 98 are in the lower diskshaped end of the latch member 65.

At the lower end of the latch member is a cutout arm H6, which arm serves to open the circuit through the switch H2, as will be explained hereinafter.

The hammer is shown in its raised position in Fig. 3 of the drawings, ready for an operative stroke. If the operator moves the hand control 88 Idownwardly, the latch member 65 will be moved in a counterclockwise direction and release the pin 59. At the same time, the member I`I4 will close the circuit through switch III and energize the solenoid 15 which will bring the hammer downwardly against the tool holder. As soon as the control member 88 is released, the spring II5 will restore the arm 85 to the position shown in Fig. 3, thus opening the switch III to de-energize the solenoid 15 and closingthe switch II2 to energize the solenoid |01, and thus eiiect a return stroke of the hammer. During this stroke, the pin 59 will engage Vthe cam surface 69 of the latch member 65 and cam it rearwardly to permit the pin 59 to pass into the notch 68. which movement of the latch member 65 will be permitted by the lost motion engagement of the slots 98 with the pins 99. The device is now in readiness for a subsequent operation.

It will be understood that the switches I I I and II2 (and also switch 83) comprise spring contact members biased to stand normally in open position. When the arm is in the position shown in Fig. 3, the switch II2 would be closed by the member I I3 were it not for the fact that it is held open by the cutout arm IIB on the latch member which holds the switch open when the notch in latch member engages thhe pin 59 as it does when the parts are at rest. However, when after an operative stroke the arm 85 is returned to the position shown by its spring I I5, the upper cam end of the latch member is engaged by the pin 59 and the cutout arm is held out of engagement with the switch, thus permitting the latter to be closed by member II3. As soon as the notch in the latch member slips over the pin 59, the cutout arm opens the switch.

While I have shown and described some preferred embodiments of my invention, it will be understood that it is not to be limited to all of the details shown but is capable of modification and variation Within the spirit of the invention and within the scope of the claims.

What I claim is:

1. A machine of the class described, comprising a reciprOCably mounted tool holder, a hammer adapted to strike said'tool holder upon its descent, a pivotally-mounted arm carrying said hammer, a movable latch member-.adapted to engage a part of said arm and hold the hammer in elevated p0- sition, spring means to urge said latch member toward engaging position, said member having a cam-shaped surface to be engaged and moved by said part on the arm when the hammer is raised. and means for actuating the latch member to effect disengagement thereof from said part.

2. A machine of the class described, comprising a reciprocably mounted tool holder, a hammer adapted to strike said tool holder upon its descent, a pivotally-mounted arm carrying said hammer, a movable latch member adapted to engage a part of. said arm and hold the hammer in elevated position, spring means to urge said latch member toward engaging position, said member'having a cam-shaped surface to be engaged and-moved by said part on the arm when the hammer is raised, means for actuating the latch-member to eiect disengagement thereof from saidpart, spring means to eiect the raising of the hammer, and means t0 effect a down stroke thereof against the action of said last-named spring means.

3. A machine of the class described, comprising a reciprocably mounted tool holder, a hammer adapted to strike said tool holder upon its descent. a pivotally-mounted arm carrying said hammer, a movable latch member adapted to engage a part 0f said arm and hold the hammer in elevated position, spring means to urge said latch member toward engaging position, said member having a cam-shaped surface to be ensagedand moved by saidpartonthearmwhenthehammer israised, means for actuating the latch member to eifect .disengagement thereof from said part, spring meanstoeifecttheraisingofthehammer,anda solenoid to effect the down stroke thereof against the action of said last-named spring means.

4. A machine of the class described, comprising a reciprocably mounted tool holder. a hammer adapted to strike said tool holder upon its descent, a pivotally-mounted arm carrying said hammer, a movable latch member adapted to engage a part of said arm and hold the hammer in elevated position, spring means to urge said latch member toward engaging position, said member having a cam-shaped surface to be engaged and moved by said part on the arm when the hammer is raised, means for actuating the latch member to effect disengagement thereof from said part. spring means to eifect the raising of the hammer, and a pivotally mounted solenoid to eil'ect the down stroke thereof against the action of said lastnamed spring means. u

5. A riveting or like machine, comprising a frame, a pivotally-mounted hammer, power-operated means for effecting an operative stroke of the hammer including a plunger pivoted to the hammer, and a member pivoted to the frame coperating with said plunger.

6. A'riveting or liketool, comprising a frame, a hammer pivotally mounted on the frame, a solenoid, a plunger actuated by the solenoid and connected to the hammer to effect an operative stroke thereof, latching means to hold said hammer in raised position. and a control member operative to release said latching means and energize said solenoid.

' means for said solenoids actuated alternately by 7. A riveting or like tool, comprising a frame,

Vsaid control member upon oscillation thereof.

11. A riveting or like tool, comprising a frame, a hammer pivotally mounted on the frame, a solenoid, a plunger actuated by the solenoid and connected to the hammer to eiIect an operative stroke thereof, latching means to hold said hammer in raised position, and a control member operative to release said latching means and energize said solenoid, said latching means comprising a pivoted member engaging a part of said arm and said control member having a lost motion connection with said member.

12. A riveting or like tool, comprising a frame, a hammer pivotally mounted on the frame, a solenoid, a plunger actuated by the solenoid and connected to the hammer to eect an operative stroke thereof, latching means to hold said hammer in raised position, and a control member operative to release said latching means and energize said solenoid, said latching means comprising a pivot member having a cam-shaped end anda recess, said hammer having a part adapted to engage said end and to be engaged in said recess, and said control member being pivoted coaxially with said first pivoted member and having a lost motion connection therewith.

13. A machine of thel class described, comprising a-reciprocably mounted tool holder, a hammer adapted to strike said tool holder upon its descent, a pivotally-mounted arm carrying 8. A riveting or like tool, comprising a frame, l

a hammer pivotally mounted on the frame, a solenoid, a plunger actuated by the solenoid and connected to the hammer to eil'ect an operative stroke thereof, latching means to hold r said hammer in raised position, a control member operative to release said latching means and energize said solenoid, and means to eii'ect a. return movement of said hammer upon release of said control means, said last-named means comprisinga spring connected to said hammer on the side of its pivot opposite the plunger connection.

9. A riveting or like tool, comprising a frame, a hammer pivotally mounted on the frame, a

said hammer, a movable latch member adapted to engage a part of said arm and hold the hammer in elevated position, spring means to urge said latch member toward engaging position, said member having a cam-shaped surface to be engaged and moved by said part on the arm when the hammer is raised, a control arm pivoted adjacent said latch member and having a lost motion connection therewith. electrically operating means for eiecting an operative stroke of the hammer, and said control arm when actuated in one direction serving to disengage said latch member from said hammer and close said switch.

14. A machine of the class described, comprising a reciprocably mounted tool holder, a hammer adapted to strike said tool holder upon its descent. a pivotally-mounted arm carrying said hammer, a movable latch member adapted to engage a part of said arm and hold the hammer in elevated position, spring means to urge said latch member toward engaging position, said member having a cam-shaped surface to be engaged and moved by said part on'the arm when the hammer is raised, a manually actuated member pivoted adjacent said latch member and having a lost motion connection therewith, power means to effect an operative stroke of the hammer, power means to effect a return stroke of the hammer, and a control device for each of said power means, said devices being disposed on opposite sides of said manually actuated member whereby said member actuates one o1' said control devices and moves it in one direction and the other thereof when moved in the other direction. f"

15. A riveting or like tool, comprising a frame, 5

erated means to effect movement of said plunger to bring about an operative stroke oi.' the hammer, latching means to hold said hammer in raised position, and a control member operative to release said latching means and to energize said power-operated means.

HERMAN BLOSS. 

